Hydraulic implement



Aug. 8, 1939. p. J, ROBlSON 2,168,496

HYDRAULIC IMPLEMENT Filed Sept. 14, 1937 2 Sheets-Sheet l mfemor Pff, Pausa@ B m @15m Q Aug. 8, 1939. P. J. RoBlsoN HYDRAULIC IMPLEMENT Filed Sept. 14, 1937 2 Sheets-Sheet 2 P. 17. Fa son wl, 1.: z

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Patented Aug. 8, 1939 UNITED STATES PATENT OFFICE HYDRAULIC IMPLEMENT Paul James Robison, Thompson, Ohio Application September 14, 1937, Serial No. 163,853

1 Claim.

This invention appertains to new and useful i improvements in hydraulically operated tools and more particularly to a tool in the nature of a jack which can be used in various positions. l

The principal object of the present invention is to provide a hydraulic tool of the character stated which can be used in upright, inverted or horiable bracket.

Figure 4 is a cross sectional view taken substantially on the line 4-4 of Figure 2.

Figure 5 is a diagrammatic view showing the valve and pump in section. i

Figure 6 is a detail sectional view showing the check valves.

Referring to the drawings wherein like numerals designate like parts, it canbe seen that numeral 5 represents the case of the `iack including the spaced walls a-b defining a compartment in which the hydraulic medium 6 is located. One end of this case 5 is reduced and threaded as at 'I for engagement into the internally threaded annulus 8 of the bracket 9 which is provided with an apertured foot portion IU at one end for attachment to any desired structure.

Slidable through the end portion 1 of the case 5 and through the packing gland II therein, is the piston rod I2 projecting from the piston I3 operative in the bore I4. A coiled compressible spring I5 is located in the bore I4 and "is interposed between the piston I3 and the end portion 1 of the case.

suitably secured to the case 5 is the pump barrel I5 in which the plunger I'I is operative. Extending from the plunger I1 through one end v of the barrel I6 is the rod I8 which is connected as at Il to an intermediate portion o1' the hand bar 2l, which hand bar is, in turn, supported by the post 2l.

A duct 22 extends from the pump barrel I6 to open into the bore I4, while a tube 23 extends from the barrel I3 to the central portion of the valve shell 24.

From a radial position about the central portion ot the shell extend the tube sections 2 5, one

(Cl. GIL-52) extending toward each end of the hydraulic fluid chamber and a pair of these tubes 25 extending in a circumferential direction about the cylinder I4. Thus, regardless of the position of the jack, fluid in the spaced wall construction can be drawn into the pump. The valve includes the rotor 26 having a bore 21 therein which can by rotation connect up the tube 23 with any one of the tubes 25. A release valve 30, of any suitable type, is provided for connecting the lower end of the bore I4 with the chamber 6 so that when this Valve is open the spring I5 will cause the piston I3 toreturn the oil from the bore I4 into' the chamber 6. A spring-pressed check valve 3l prevents the oil from owing from the bore I4 through duct 22 into the pump I6 when the piston I1 is moved upwardly and a spring-pressed check valve 32 prevents the oil from discharging through the pipe or tube 23 when the pump piston Il is moved downwardly, these valves being of conventional form but being shown as arranged in the enlargement 33 at the lower part of the pump cylinder. I'he valves 30, 3i and 32 can be of any suitable construction and they form no part of my invention.

The other end of the rod I2 is provided with a suitable adapter 28 whereby it can be connected to any desired structure.

While the foregoing specification sets forth th'e invention in specific terms, it is to be understood that numerous changes in the shape, size and materials may be resorted to without departing from the spirit and scope of the invention as claimed hereinafter.

Having described the invention what is claimed as new is:

In a hydraulic jack including a case having a cylinder therein and a fluid reservoir surrounding the cylinder, a spring-pressed piston operating in the cylinder and a pump having a duct connecting the pump with the lower end of the cylinder; a valve casing connected to a portion of the exterior wall of the case intermediate the ends thereof, an inlet pipe connecting the pump with the central portion of the valve casing, a pipe connecting the valve casing with the lower end of the reservoir, a second pipe connecting the valve casing with the other end of the reservoir, a pair of pipes connecting intermediate portions of the reservoir with the valve casing, said pair of pipes extending to points at opposite sides of the cylinder and a manually operated valve body in the valve casing for connecting the inlet pipe with any one of the four pipes in communication with the reservoir, all of said four pipes being of rigid construction.

PAUL 'JAMES ROBISON. 

